The radiative tail from elastic peak to deep inelastic scattering of polarized particles within standard electroweak theory

In this paper we obtain the formulae for the invariant inclusive cross section of the elastic radiative tail (ERT) and other observables which shall be measured in forthcoming lepton-nucleon (l-N) experiments. Taking into account the parameters of these experiments a realistic approximation of peak type is developed. On the basis of the exact formulae obtained, the effectiveness and usefulness of this approximation is discussed. The influence of the choice of different proton form factors is also considered. (Author)